build: update less-loader to version 6.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
less-loader	dependencies	minor	6.0.0 -> 6.1.0

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Release Notes

webpack-contrib/less-loader

v6.1.0

Compare Source

Features

• new implementation option (#​354) (d2de80f)

Bug Fixes

• respect third-party plugins for Less (#​353) (d0db4f9)

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